Each repository has system tasks. They can be found in the System Tasks folder in the Repositories pane within the Workflow tab. System Task Lists allow you to execute a task list without having the Workflow system open in the Client.
Note:
System Tasks configured with the Set Property Value action and the Work Item Property option selected will not execute properly.
To create a system task:
In addition, you can edit the Document Types assigned to a system task in the Properties pane's Document Types tab for system tasks configured for documents. You can edit the user groups assigned to a system task in the Properties pane's User Groups tab.